KVM vm corruption

My Setup 4x Virtual Hosts w/ 2x Quad core and 30gb ram running Proxmov VE 1x RHEL5 file server w/ 6X 73gb 15000rpm scsi drives raid6 1x RHEL6 backup file server 2x 2tb drives software raid0 I have a few virtual machines running on this cluster and they are mixed windows and linux vm's. I have been having some weird issues with the linux vm's, the hard drive image on a few of the seems to get corrupted every once in a while. I had a RHEL6 vm and had given access to a user and every few weeks he reports to me that the vm filesystem is read only. At that time it was only that vm doing it, so I fixed the filesystem but booting a live cd, mounting the system and running a disk check. Unfortunately the problem kept comming back and could not be easily fixed. So I changed this vm to Ubuntu 10.04 server thinking that it might work better. The problem is back again, but this time it can be fixed with a reboot and it checks the disks and fixes "orphaned inodes". I am now having this issue on another RHEL vm and my Backtrack VM. What is weird about this is that this problem only affects the linux vm's, not any of my Windows vm's. All of my vm hard disk are in raw format, could changing to qcow2 help? What are the major advantages of qcow2? Does anyone have anythoughts and things to look for to fix this issue? I have tried looking for things in the log files and have not had much luck(probably because the filesystems are read only, lol). Thanks Jordank

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